290645 Effect of Partial A-Site Substitution On Carbon Dioxide Reduction by Oxygen Absorption On Lanthanum Cobalt Perovskite-Oxide Structures

Monday, October 29, 2012
Hall B (Convention Center )
Ryan Kent, Yolanda Daza and John N. Kuhn, Chemical & Biomedical Engineering, University of South Florida, Tampa, FL

Today’s world encounters a growing issue with greenhouse gases, the most significant of which is carbon dioxide. The long term goal of this research is to reduce carbon dioxide emissions by conversion to carbon monoxide, which can be used in fuel production. Perovskite-oxide structures, which follow the molecular form ABO3, are well studied for their high oxygen mobility and ability to be tailored for a specific purpose. The effect of partial ion substitution changes the properties of the metal oxide. (La1-XMX)CoO3 (M= Sr, Ba) Perovskite powders were synthesized by sol-gel synthesis and analyzed by X-Ray Diffraction and Temperature Programmed Experiments (Oxidation and Reduction) for their capabilities in the reduction of carbon dioxide. From these experiments, temperatures for the reduction and subsequent oxidation were picked in order to maximize carbon monoxide production during an isothermal conversion. The effect of partial ion substitution on the A-site is compared against LaCoO3 oxide. Results showed Strontium ion substitution was more effective in isothermal carbon dioxide conversion than Barium ion substitution.

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